Fluid-pressure-reducing device



D. CROWTHER.

FLUID PRESSURE REDUCING DEVICE.

APPLICATION HLED JULY 28, 19i9.

1 ,360,504;, Patented Nov. 30, 1920.

4. l2. IO 42 & 1 AXML/ F/c -Z INVENTOR' DAV/o CROWTHER.

A TTOHNEYS.

DAVID CROWTHER, 0F MINNEAPOLIS, MINNESOTA.

I FLUIDLVPRESSURE-REDUCING DEVICE.

Specification of Letters Patent.

Patented Nov. 30, 1920.

Application filed July 28, 1919. Serial No. 313,778.

To (6Z6 7.0/1012L it may concern g p e it known that 1, DAVID Cnow'rHnR,a citizen oi the United States, residing at 'i mneapohs, in the countyof Hennepin and Qt t f 1 m l in. 7 t ,1 -t u a e 0 imucsota, .iaic mvener tel am new and useful Improvements in Fluid- PressurellcducingDevices, of which the following is a specification.

lily invention relates to fluid pressure re ducing devices and an objectis to provide a device of this character by means of which a gas underpressure in a container may be delivered with its pressure reduced oanydesired extent regardlessoi the degree of pressure in the container.Although not confined to such use my device is, however, designedprimarily for use in connection with blow pipes for delivering oxygenwhich is under pressure in a container so that the pressure of the gaswill be reduced to nearly that of the atmosphere at the point ofdelivery to the blow pipe.

The full objects and advantages of my invention will appear invconnection with the detailed description thereof and the novel featuresembodied in my inventive idea will be particularly pointed out in theclaims.

In the accompanying drawings, which illustrate the application of myinvention in one "f0rm, V

Figure 1 is a view in elevation. Fi 2'is a view in section on the line22 of Fg. '1,

and showing the device secured to a bottle or container. Fig. 3isa'section on the line of Fi 2. Fig. 4 is a section on the line 4-4 ofFig. 2.

Referring to the particular construction shown in the crawings, thedevice comprises a clamping member 10 provided at on'e end with ascrew-threaded member 12 which at its outer end is bent to form a handle14. The clamping member at its opposite end is provided with apressure-reducing head comprising an inner tube 16,.a'n outer tube 18and a screw-threaded cap 20. As shown, the tube 18 is integral with theclamp 10 and the tube 16 has its opposite ends fitting snugly within thetube 18. The inner end oi"? the tube 16 projects beyond. the tube 18 soas to extend within the adjacent end portion of the clamp, and the outerend of the tube 16 projects beyond the corresponding end of the tube 18The bore 22 of the tube 16 is reduced where it extends through the vouter endoi the tube so as to form a small nassa 'ewa 24 and the end ofthe tube at l b .7

this place is beveled. The exterior surface otthe tube 16 is cut awayintermediate its ends so that in conjunction with the tube 18 alongitudinal groove or an annular chamber 26 is formed. The outer end ofthe tube 16 at the bottom of the beveled portion is provided with aplurality of small passageways 28. As shown, these passageways are threein number. The inner end of the an nular chamber 26 connects with apassage way or duct 30 formed in a neck member 32 integral with the tubels, this neck member serving for attachment of a flexible tube 34 forconducting the gas to the desired point. The tube 18 is exteriorlythreaded to receive the interiorly screw-threaded up 20. Within this capis a disk 36 preferably of yielding material such as fiber or softmetal' lic alloy for cooperating with the beveled end of the tube 16.The disk 36 is yieldingly backed by one or more springs. Two springs 38and 40 may be employed as shown,the utenspring 40 being stiffer andshorter thanthe spring 38 for a purpose which will presently appear. I

The operation and advantages of my invention will be readily understoodfromthe foregoing description. The device is intended for useparticularly with a wellknown form of bottle or gas container 42 havinga neck with a passageway 44 and a lateral'opening 46. A screw-threadedstem having a beveled end 48- serves to close and open communicationbetween the passage sageway 24 into the chamber within the cap Q0, fromwhich it passes through the passageways 28 into the annular chamber 26and through theneck member 32 and the tubing 34 to the desired place. Itis evident that the pressure of the gas will be reduced in proportion tothe force with which the disk 38 is held uponthe beveled end of the tube16, and that the gas can be delivered at '90 way 44 and the opening 46.Inusmg my inc any desired pressure through the tube 34 regardless of thedegree of pressure in the container 42. If the pressure in thiscontainer is very high the cap 20 will be turned down so that bothsprings 38 and 40 act to hold the disk 36 upon the end of the tube 16,and, on the contrary, it the pressure in the container is low theposition of the cap is adjusted so that the spring 38 only acts to holddown the disk 36. The pressure at which the gas is delivered thus beregulated with very great nicety regardless of the degree of pressure inthe container. On account of the beveled end of the tube 16 extendingbeyond the entrance to the passageways 28 the gas in the cap willreadily enter these passageways regardless of the force with which thedisk is held down. On account of the reaction of the spring on the capthe threads of the latter will be held in close engagement with thethreads oi the tube 18 and thus prevent leakage.

I claim 1. A fluid pressure reducing device comprising a reducing head,an outwardly leading passageway in said head, a return passagewayleading in the opposite direction from said first mentioned passagewayand spaced therefrom, a duct leading from said return passageway, and aclosure resiliently engaging the delivery end of said first mentionedpassageway.

2. A fluid pressure reducing device comprising a reducing head, a tubein said head, a disk, means for resiliently holding said disk inengagement with the delivery end of said tube, a return passagewayextending outside oi said tube, and a duct leading ironi saidpassageway.

3. A fluid pressure reducing device comprising a reducing head, an innertube in said head having a projecting delivery end, an outer tubesurrounding said inner tube, a return passageway between said inner andouter tubes, a duct leadin from said passage way, a screw cap havingscrew threaded engagement with said head, a disk in said cap, and aspring in said cap for resilientlyholding said disk in engagement withthe delivery end of said inner tube.

4-. A fluid pressure reducing device comprising a reducing head, aninner tube in said head having a beveled surface at its delivery end, anouter tube surrounding said inner tube, intermediate portions of saidtubes being spaced from each other to -form an annular chamber, passagesadjacent said beveled surface leading into said annular chamber, apassageway leading from said annular chamber, a screw cap havingscrew-threaded engagement with said head, a disk in said cap, and aspring in said cap for resiliently holding said disk in engagement withsaid beveled delivery end of the inner tube.

5. A fluid pressure reducing device comprising a reducing head, an innertube in said head havinga beveled surface at its deliver; end, anoutertube surrounding said inner tube, the intermediate portion of saidinner tube being reduced to form an annular chamher in connection withsaid outer tube, passages adjacent said beveled surface leading intosaid annular chamber, a passageway leading from said annular chamber, ascrew cap having screwthreaded engagement with said head, a disk in saidcap, and two springs in said cap for resiliently holding said disk inengagement with said beveled delivery end of the inner tube, one of saidsprings being shorter and stiffer than the other spring.

6. A fluid pressure reducing device comprising a clamp adapted to beattached to a gas container, a pressure reducing head secured to saidclamp, an inner tube in said head, the receiving end of said tube beingadapted. to be placed in communication with said container when said.head is clamped thereto, an outer tube surrounding said inner tube, theintermediate portions of said tubes being spaced from each other to terman annular chamber, passages adjacent said beveled surface leading intosaid annular chamber, a passageway leading from said annular chamber, ascrew cap having scrcwthreaded engagement with said. head, a disk insaid cap, and a spring in said cap for resiliently holding said disk inengagement with the delivery end of the inner tube.

In testimony whereof I hereunto atllx my signature.

DAVID GROWTH ER.

